Redo StreamTransformers so they work with Stack traces.

sdk/lib/_internal/pub/lib/src/utils.dart

Index: sdk/lib/_internal/pub/lib/src/utils.dart
diff --git a/sdk/lib/_internal/pub/lib/src/utils.dart b/sdk/lib/_internal/pub/lib/src/utils.dart
index d787279cf5ac56cd97eaac31ffc6c3ac64d27e95..b570d6c580e034b89d755c3ff3ee9aaa7b35e9cf 100644
--- a/sdk/lib/_internal/pub/lib/src/utils.dart
+++ b/sdk/lib/_internal/pub/lib/src/utils.dart
@@ -408,7 +408,7 @@ List<String> splitLines(String text) =>
 /// newline is ignored.
 Stream<String> streamToLines(Stream<String> stream) {
   var buffer = new StringBuffer();
-  return stream.transform(new StreamTransformer(
+  return stream.transform(new StreamTransformer.fromHandlers(
       handleData: (chunk, sink) {
         var lines = splitLines(chunk);
         var leftover = lines.removeLast();